The problem described in http://www.livestream.com/forum/showthread.php?t=8657 is happening to me now. Live streams show a single frame of the video which changes every so often and a loading graphic, but nothing ever loads.
I moved a couple of weeks ago and I don't think I've tried using Livestream since, but everything is working besides this.
I tried Opera and Firefox, Comcast's provided DNS and OpenDNS. I've tried restarting my browsers, refreshing the page, and rebooting the entire computer.
I have no "ad-block" enabled.